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engine knock

   Also found in: Wikipedia 0.03 sec.
engine knock [′en·jən ‚näk]
(mechanical engineering)
In spark ignition engines, the sound and other effects associated with ignition and rapid combustion of the last part of the charge to burn, before the flame front reaches it. Also known as combustion knock.


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Other technology used on the new engine include piston oil jets to suppress engine knock with the 10.
That creates engine knock and emissions of nitrous oxide pollution.
Their sealed configuration helps them withstand the temperature and vibration extremes of the engine compartment (some are already being employed in areas like engine knock detection).
 
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